. https://www.learnaboutlogistics.com/variability-in-supply-chains-adds-to-uncertainty/

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VARIABILITY IN SUPPLY CHAINS ADDS TO UNCERTAINTY
Variability is always present as a natural part of any process and describes the random disruptions that may occur as a process or event is undertaken. In supply chains, Variability is the term associated with the difference between actual and planned lead times, which are not static. Variability exists at all tiers of a supply chain: supply of materials and components, production through various machines and deliveries to customers. Variability is one of three factors that influence the level of Uncertainty in an organisation’s supply chains; the other two factors are Complexity and Constraints. READ MORE